The DOD SR231QXLR Graphic EQ is two constant Q, 31-band, 1/3-octave equalizers in a steel chassis that inhabits only two rackspaces. Low-cut filter at 50Hz with a 12dB/octave slope. Back panel boasts two balanced XLR and two 1/4" inputs and the same outputs. Fully shielded internal power supply, steel chassis, and high-end circuitry for crystal-clear signal path.

So if you're like me, then you perhaps you were looking for a cheap balanced equalizer just to do some basic equalizing and hopefully to convert those unbalanced lines to balanced at the same time.Unfortunately, what they do not tell you except in the engineering specs is that "The output section shall have two outputs?balanced XLR and impedance balanced 1/4" TRS jacks."Impedance balanced means that there's no differential signal in the line (the mirror copy that helps with noise rejection). In other words only the XLR outs are truly balanced. The 1/4" jacks are using a faux-balancing technique.I verified this with an oscilloscope. Unless you are absolutely sure that you will only use the XLR jacks, then it's not worth it. It will add objectionable sounds to your audio.Get an EQ that doesn't cut corners!

This unit will add one or more many different kinds of hums and/or buzzes to your setup depending upon the setting of the eq. Also note that the two channels are not balanced very well with each other.

I purchased my SR231QXLR second hand from a client whom I've worked with for years. It sounds just as nice as it did from day 1, sliders are responsive, and does not add excessive noise with in my live setups or in our TV studio. Minor things to nit-pick: Would like a larger output meter per channel, and the power switch is confusing at first for those not familiar with the layout.

Have owned this EQ for less than a year and one channel went dead. EQ was a piece of junk from the start. Will never buy a DOD product again. Your better to just spend the extra money and buy a good product. Stick with DBX their about the best out on the market.

This EQ performs exceptionally well. I own three and have never had any problem with any of them. They are clean, they are quiet. The center frequencies are accurate. Both the unbalanced and the balanced inputs and outputs work beautifully and sound great. Both the headroom and the noise floor are impressive. Distortion is for all intents and purposes non-existent. With balanced inputs/outputs you will want to use XLR connections... why would you do otherwise?The price is right, the performance is excellent. Great value.

Thing EQ is good for bass, guitar, live sound, recording. Everything. I'm useing mine with bass with an ampeg 4 pro through crate 4x10 and 1x15. It cleans up everything thing. I thought the 4 pro was amazing than hooked up the eq my friend just had for some reason and it made it sound even better.

I've use DOD Equalizers in my sound systems for over 17 years. I have three sound systems for different size venues. I've never had any problems with this product. I still use a Real Time Analyzer to shot the room, set the graphic and no feed back, you get the best sound you can get for the room. I like my monitors real hot so setting the graphics is important for no feed back. I'd buy this product again tomorrow.